Not normally, not that I've seen, but he definitely was against Vanes.

and Hernandez. I think his dirtiness is methodical, not necessarily a part of his fighting style (i.e. Mares or Bradley). To him, it's like clinching, just another way to break the opponent's rhythm. Also, he's getting into his opponent's head. Look at how Hernandez and Vanes started fighting after Lara would do something dirty.